Method and apparatus for fast determination of initial transversal equalizer coefficient values

In a synchronous data transmission system comprising a transmitter for transmitting data through a transmission channel causing distortions to a receiver including a transversal equalizer, a system for determining the initial values of the equalizer coefficeints comprising:

• in the transmitter
• means for generating a sequence (v.sub.i) of L elements v.sub.i, each of the elements v.sub.i being defined by the relation v.sub.i = u.sub.i + m, where u.sub.i 's are the binary elements of a periodic binary pseudo-random sequence (u.sub.i) having the following property
• A.sub.0 =L and A.sub.j =-1 for j=1, . . . , (L-1) ##EQU30## and m is a constant defined by the following relation ##EQU31## means for transmitting said sequence (v.sub.i) through the transmission channel,
• in the receiver
• means adapted for receiving the sequence (x.sub.i) of elements x.sub.i, each of the received elements x.sub.i corresponding to a transmitted element v.sub.i,
• means for determining the samples r.sub.j of the transmission channel impulse response obtained by correlating over a period L the elements of received sequence (x.sub.i) with the elements of emitted sequence (v.sub.i);
• means for calculating autocorrelation matrix B of samples r.sub.j ;
• and
• means for determining the coefficient initial values from the following relation:
• C.sub.opt = B.sup.-1 R
• where
• C.sub.opt is the coefficient value column vector,
• B.sup.-1 is inversed matrix B, and
• R is the r.sub.j inversed column vector.